Ti-6Al-4V合金弹着点及其周围组织变化与损伤

Damage Behavior of Crater and Microstructure Evolution of Ti-6Al-4V Alloy

采用Φ7.62 mm装甲钢平头子弹对Ti-6Al-4V合金进行侵彻,分析了Ti-6Al-4V合金弹着点及其弹着点周围宏观与微观组织变化与损伤。结果表明,Ti-6Al-4V合金弹着点微观组织变化与损伤与侵彻不同阶段所受应力、应变、应变硬化、热软化和弹头形状等因素密切相关。在高应变率下,Ti-6Al-4V合金绝热剪切带的形成是一个由萌生、扩展、完全发展组成的过程。Ti-6Al-4V合金弹着点在不同发展阶段的组织变化与损伤不同,各个阶段靶板受力状态在其微观组织变化与损伤中起到非常重要的作用。

The targets of Ti-6Al-4V alloy were impacted by a 7.62 mm diameter armored steel ball with a speed of 0.662 km/s. The damage behavior of crater as well as microstructure evolution was observed. Results show that the formation of adiabatic shear band of material goes through three processes of initiation, expansion and full evolvement. The stress, local shear strain, hardness, heat softening and the shape of the ball at the initialization have influences on the damage behavior of crater and the microstructure evolution of Ti-6Al-4V alloy at the moment of penetration armored plate. The microstructure and damage behavior of crater are quite different, during which the stress plays a very important role.